BauderPIR T on large roofs. Setting out valleys, falls and plant zones
PIR insulation
When laying BauderPIR T, first set out the valley that will carry water to the outlet. Mark levels at both ends and wherever the valley changes direction. The fall marked on a tapered board describes one plane. Where two planes intersect, the gradient along their common line can differ. Check the longitudinal profile of the valley separately, particularly beside plant bases. Transfer the plan to the roof using one datum for deck and insulation levels. This allows a step in the route to the outlet to be identified before waterproofing.
In this guide
Tracing the route from high point to outlet
Follow the drawing from the highest corner of the field to the outlet. Mark a survey point at each break and record its offset from the building grid so the measurement can be repeated after insulation is laid.
Identifying the tapered boards
Mark the outlet, field boundary and every obstruction the water must pass on a drawing shared by the roofer and services installer. If adjacent fields drain to separate outlets, show the watershed between them.
Calculating the rise along a run
BauderPIR T is a 1200 × 800 mm square-edged board with no factory facing. The Polish data sheet lists gradients from 1 to 5% in increments of 0.5 percentage points. Check the specified fall and end thicknesses against the pallet markings and layout.
Along the line of steepest fall, a 4.80 m run at 2% gives a 96 mm level difference. Add this to the low-end level. If the deck itself slopes, include it in the same section to establish the final surface profile.
Measuring along the valley
Check the valley starting at the outlet. Measure successive surface levels upstream and compare them with the longitudinal profile. A local dip followed by a step can trap water even when the two end levels of the run are correct.
Routing water around plant bases
Once the plant base is in place, compare its actual footprint with the valley line. If it blocks the flow path, send the designer its surveyed position and the levels on both sides. Add the agreed diversion to the plan before cutting the tapers.
Inspection before waterproofing
Before waterproofing, match board numbers to the drawing, survey the field junction and inspect the fit at the outlet flange. Record readings against the survey point numbers and document repairs after remeasurement.
As-built drainage plan
On the handover plan, trace each valley to its outlet and mark existing diversions around services. If the roof is altered later, new equipment positions can be assessed against the entire drainage route.
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